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Note 7 - Right of Use Assets - Balanace Sheet Information Related to Leases (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Right of use assets, net $ 30,106 $ 30,100
Other current liabilities 5,861  
Operating lease liabilities 24,277  
Total operating lease liabilities 30,138 $ 30,100  
Property and equipment, at cost 410,053   403,785
Accumulated depreciation (248,346)   (244,176)
Property and equipment, net 161,707   $ 159,609
Other current liabilities 19    
Other long-term liabilities 51    
Total finance lease liabilities $ 70    
Operating leases (Year) 7 years    
Finance leases (Year) 4 years    
Operating leases 3.70%    
Finance leases 3.70%    
Assets Held Under Finance Leases [Member]      
Property and equipment, at cost $ 86    
Accumulated depreciation (19)    
Property and equipment, net $ 67